[R-pkg-devel] Problem with MathJax in r-release
The cause of the problem is clear: If you look at the sources of https://cran.r-project.org/web/packages/metap/refman/metap.html you will see repeated instances of <script id="MathJax-script" async src="../../mathjaxr/doc/mathjax/es5/tex-chtml-full.js"></script> which is invalid HTML. I am not sure where this is coming from, because a recent update to mathjaxr should have fixed this, and \mathjaxr is now supposed to produce something different: https://github.com/cran/mathjaxr/blob/master/man/macros/mathjax.Rd#L5 Could be that versions are still catching up, so maybe wait a few days. Best, -Deepayan
On Wed, 17 Dec 2025 at 20:21, Michael Dewey <lists at dewey.myzen.co.uk> wrote:
I use the mathjaxr package to disply the formulae in my package. It has been working for some while including in R 4.2.2. However when I checked a new version of the package (metap) in r-devel I get a Note which starts * checking HTML version of manual ... NOTE Found the following HTML validation problems: metap.html:553:1 (dat.metap.Rd:18): Warning: <script> anchor "MathJax-script" already defined and then carries on with the same warning for each .Rd file. The relevant line is where it loads mathjax. At the moment this is only a NOTE so I could either try my luck explaining to CRAN or change every instance of mathemtical formulae in every .Rd file. I am reluctant to do either of them until I understand what is happening. A possible clue might be in the NEWS for r-release The HTML help system has several new features: LaTeX-like math can be typeset using either KaTeX or MathJax, usage and example code is highlighted using Prism, and for dynamic help the output of examples and demos can be shown within the browser if the knitr package is installed. These features can be disabled by setting the environment variable _R_HELP_ENABLE_ENHANCED_HTML_ to a false value. So the new message might be coming from that new check. Does anyone know what the explanation is or can offer advice aboud my way forward? -- Michael Dewey
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